Answer / hiren

Parallel connection to Voltage source

Answer / carl_ellis

A second power supply is wired in parallel with the first, but redundant/parallel power supplies should be decoupled from each other with power diodes, where each diode is forward biased on the power supply (+) output with the diode (-) coupled in common to the load).

The diodes need to be rated to carry the full current load. If diodes are not used, a severe fault in one of the power supplies could cripple the output of the 2nd power supply.

The isolation diodes must be installed on a heatsink to maintain operating temperature at a safe level. The power dissipation on the diode is determined by the product of the current passing through the diode and its "on" diode voltage drop.

Some recommend the use of Schottky diodes rather than silicon diodes becaus Schottky diode has a lower voltage drop so it runs cooler.

There are commercial diode decoupling/isolation packages sold with appropriately sized heat sinks to keep the diodes within temperature spec.

Carl Ellis
Measure First

Air pressure in a pressure vessel can rise or fall at up to 2.5kpa/s.The pressure is sampled every 0.5 seconds.If range of the the pressure indication is 0 to 1500 kPa, what is the max value of the error due to sampling in % of Span

2 Answers  

---

Gas equation

0 Answers   CCIE,

---

if a dp transmitter has range 100 in H2O and flow is 20mmcf and if the flow is changed to 25 mmcf then what is the formula to determine new range of transmitter

1 Answers   TATA,

---

Dear sir I am MD.zafar eqbal. I have taken this id from allinterwiev .com I have qustion if you dont mind. 1.what is the maximum operating temprature in instrumentation. 2. I want know about viberation i mean wahat types of sensor used in viberation And what types of trabsmitter used.and hiw to control it and wher is used of viberation transmitter and finally how to control it and what types of fault come. Sorry for disturbing you. I know you have no reason for help me. Because you dont know about me.but i request you please help me these question are very usefull for my feauture.plz sir Thanking you. Sent from Yahoo! Mail on Android

4 Answers  

---

What are the instrumental diagram of valve.

2 Answers   Karnataka Power,

---

what is pt100 RTD, and does 100 stands for

8 Answers   Tata Power,

---

what is bms?

4 Answers   Emco,

---

why generation of syncronized generator increases when frequency of grid is less then 50Hz & generation decreases when grid frequency goes up from 50 Hz, as comparision with set value entered in govering panel?

1 Answers  

---

what is the relation between flow and pressure.for example relationship between level and pressure is p = phg like that i want ans for this question.and also how to calculate orifice sizing and flow transmitter. pls some one ans for this questions.

3 Answers   Orchid, SRF,

---

if i change range of flow transmitter in th field then does it need to change range in dcs?

3 Answers  

---

What is 3 selection available when configure the burnout protection for controller

0 Answers   EI Electrotechnical Institute,

---

sir, give me placement papers and interview quistion of birla group company of copper.

0 Answers   Birla,

---